[1]} find a better diffusion architecture through a series of exploratory experiments, leading to the Ablated Diffusion Model (ADM). This model outperforms the state-of-the-art in image synthesis, which was previously provided by GAN based-models, such as BigGAN-deep [2]} and StyleGAN2 [3]}.
ADM is further improved using a novel Cascaded Diffusion Model (CDM). Our contribution is fundamental and can be incorporated into the proposed ADM and CDM architectures.
